Transparent Display Micro Lens Layout for Brightness Without Haze
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Solution Overview
Problem
Conventional transparent displays suffer from insufficient brightness due to total internal reflection of light emitted by micro light-emitting diode chips, and the use of micro lens arrays to enhance brightness reduces transparency by scattering external light.
Innovation Solution
A micro lens array structure is formed only above the light-emitting elements, ensuring that external light is not scattered while enhancing light emission, and the encapsulation layer and micro lens array are fabricated in a single process to improve brightness and transparency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a micro lens array is added to enhance brightness, then peak brightness is improved, but transparency deteriorates due to light scattering
Solution Approach 1:
The micro lens array is selectively positioned only above the light-emitting elements (opaque areas) rather than covering the entire display surface. This local placement ensures that light scattering occurs only where necessary to enhance emitted light, while the light-transmitting areas remain free of micro lenses, preserving external light transmission and transparency.
Solution Approach 2:
The display surface is divided into distinct functional zones: opaque areas above light-emitting elements where micro lenses are placed to enhance brightness, and light-transmitting areas where no micro lenses are present to maintain transparency. This segmentation allows simultaneous optimization of both brightness and transparency in different regions.
2Measurement precision
If micro light-emitting diode chips are used, then display resolution is improved, but brightness is insufficient due to total internal reflection
Solution Approach 1:
The micro lens array acts as an intermediary optical element between the micro light-emitting diode chips and the external environment. It captures light that would otherwise undergo total internal reflection at the encapsulation layer interface and redirects it outward, enhancing the effective brightness of the display while preserving the high resolution provided by the micro LEDs.
3Object-affected harmful factors
If the encapsulation layer is made transparent to allow external light penetration, then transparency is improved, but light emission efficiency deteriorates due to total internal reflection
Solution Approach 1:
The micro lens array serves as an intermediary that works in conjunction with the transparent encapsulation layer. It captures light at the encapsulation layer interface and redirects it outward, overcoming the total internal reflection barrier while maintaining the transparency of the encapsulation layer itself. This allows the encapsulation layer to remain transparent for external light penetration while still enhancing light emission efficiency.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The transparent display achieves a significant increase in peak brightness while maintaining high transparency by minimizing light scattering and deformation of external light, with a 243% brightness improvement and only a 3% reduction in transparency compared to conventional displays.
Implementation Method 1
The surface of the transparent encapsulation layer above the plurality of light-emitting elements has a micro lens array structure
Implementation Method 2
enhancing light emission
Implementation Method 3
The transparent encapsulation layer covers the plurality of light-emitting elements
Implementation Method 4
the light-emitting elements 12, 13, and 14 emit light L1 to the outside of the transparent display 10
Implementation Method 5
micro-light emitting diodes
Data Source
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AI summary
A transparent display includes a transparent driving board, a plurality of light-emitting elements, and a transparent encapsulation layer. The light-emitting elements are arranged on the transparent driver board. The transparent encapsulation layer covers the light-emitting elements. The transparent encapsulation layer has a micro lens array structure on the surface above the light-emitting elements. The micro lenses of the micro lens array structure hardly cover the light-transmitting area of the transparent display. Thus, the transparent display has high transparency and high brightness.